Prechamber mounting



ly 8, 1969 J. 5. SALETZKI ETAL 3,453,993

PRECHAMBER MOUNT ING Filed sa x. 27, 1967 Sheet of 2 JACOE 5. 544572 I AVG/V4190 F. RE/C/VEL INVENTORS July 8, 1969 J. S. SALETZKI ETAL PRECHAMBER MOUNTING Filed Sept. 27, 1967 Sheet v 5 of 2 E FUEL 3 4 4 TANK #605 s: 544 7'Z/(l RIC/ 4RD F. &4

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, ArroR/vevs United States Patent PRECHAMBER MOUNTING Jacob S. Saletzki, Peoria, and Richard F. Reichel, Washington, Ill., assignors t0 the United States of America as represented by the Secretary of the Navy Filed Sept. 27, 1967, Ser. No. 671,161 Int. Cl. F02b 3/00 US. Cl. 12332 2 Claims ABSTRACT OF THE DISCLOSURE Apparatus in the form of a welded assembly containing a precombustion chamber and means for clamping same within an internal combustion engine to provide a certain amount of spring action to compensate for the difference in expansion between the steel welded assembly and an aluminum head.

This invention relates to internal combustion engines and more particularly engines having an aluminum cylinder head and opposed flanged assemblies having precombustion chambers therein mounted adjacent thereto.

In the past many types of clamping means have been used to hold precombustion chambers in place, but within the knowledge of applicants various types of threading means have been used. These clamping means do not allow for differences in expansion between the precombustion chamber assembly and head and great damage is caused thereby, such as cracking or distortion.

The principal object of the present invention is to provide a new and improved clamping bar member designed to provide spring action to allow for differences in expansion between a steel precombustion welded assembly and an aluminum cylinder head.

Another object is to provide a new and improved clamping bar supported centrally upon an engine cylinder head the outer extremity of same being forked and adapted to engage the top of opposed welded assemblies containing precombustion chambers.

The above and other objects of the invention will appear more fully from the following more detailed description, and from the drawing, wherein:

FIGURE 1 is a cross-sectional view of an engine cylinder head with the clamping bar mounted thereon, and

FIGURE 2 is a top plan view showing the top flanged portion of the precombustion welded assembly and the forked end portion of the clamping bar in contact therewith.

Referring now to the drawings, the numeral designates a cylinder head of an internal combustion engine formed of aluminum, or the like, and numeral 12 designates a welded one piece assembly made up of machined steel components having formed therein a precombustion chamber 28. Assembly 12 also has formed thereon a top flange portion 14, a lower flanged portion 16, and an O-ring 18. Assembly 12 is cored, as at and a portion thereof is threaded, as at 22, to receive a bonnet 24, one only being shown.

The lower extremity of cored portion 20 is tapered, as at 26, the same leading into the precombustion chamber 28. The lower portion of assembly 12 is cored, as at 30, to form a fuel line 32 leading from chamber 28.

A clamping bar member 36 is provided, the same comprising an elongated bar member supported above and midway on cylinder head 10 by means ofa bolt 38 which in turn passes through bar member 36 and has the lower extremity of same threaded, as at 40, to engage the cylinder head. The opposed ends of bar 36 are forked, as at 42, to rest upon the top flanged portion 14 of welded assembly 12. Numeral 44 designates a fuel pump and 46 ice a fuel tank. Numeral 48 designates an opening in the lower portion of cylinder head 10 and 34 a reduced portion of welded assembly 12.

The manner in which the device operates is as follows:

The clamping bar 36 is secured to cylinder head 10 by threaded bolt member 38 into the cylinder head as shown in FIG. 1. The forked end 42 of bar 36,. FIG. 2, straddles bonnet 24 which is threaded into chamber 12, as at 22, and rests upon the top of flange portion 14 of welded assembly 12. Bar 36 is designed to provide spring action which enables same to compensate for the difference in thermal expansion between the steel welded assembly 12 and the aluminum cylinder head 10. The downward pressure of opposed forked ends of bar 36 on top flange portion 14 of assembly 12 is imparted downwardly on assembly 12 and tends to hold the reduced portion 34 of said assembly within opening 48 located in the lower portion of cylinder head 10. The floating bar member 36 takes care of the difference in the coefficient of expansion between the quickly expanding aluminum cylinder head and the slowly expanding steel assembly. Inasmuch as the lower extremity of assembly 12 is seated freely in opening 48 and not secured rigidly therein, as by threading and held downwardly by arm 36, expansion can take place without the tendency to cause breakage or distortion of the steel assembly.

There has been disclosed herein a new and novel means for clamping a steel welded assembly made up of machined steel components and containing a precombustion chamber within an aluminum cylinder head and having means provided to springably hold said steel assembly in yieldable relationship with said cylinder head to compensate for the different rates of expansion between the steel and aluminum.

It will be noted that the construction shown and described will serve admirably to accomplish the objects stated above. It is to be understood, however, that the construction disclosed above is intended merely as illustrative of the invention and not as limiting, as various modifications therein may be made without departing from the invention as defined by a proper interpretation of the claims which follow.

We claim:

1. In an internal combustion engine having a head and at least a pair of reduced thread free flanged assemblies each of which has a precombustion chamber located therein secured to said head and a bonnet member supported within each of said chambers, the improvement comprising;

a clamping bar mounted upon said head, the opposed extremities of said bar member being forked to straddle said bonnets and contact. the tops of said flanged assemblies and hold same yieldably within the lower reduced portion of said flanged assemblies so that the same seat freely Within said thread free openings in said head.

2. The apparatus of claim 1, wherein the clamping means is adapted to bend elastically when the flanged assembly and the head, which have different rates of expansion, thermally expand.

References Cited UNITED STATES PATENTS 1,179,912 4/1916 Hamill 12332 XR 1,845,620 2/1932 Modersohn 12332 2,148,505 2/1939 Rosen 123-32 XR 2,846,986 8/1958 Parsons 12332 3,125,078 3/1964 Reiners 123--32 3,349,758 10/1967 Gragson 12332 LAURENCE M. GOODRIDGE, Primary Examiner. 

